Rolling-mill.



No. 649,|08. Patented ma 8, I900.

w. RACHALS.

ROLLING MILL.

(Applieafion filed Feb. 17, 1899-) (No Model.)

. INVENTOR m: NORRIS vrrsns co Puoraurum WASHlNOTDN, v. c,

UNITED STATES- 1 PATENT Fries.

W'ALTER RAOHALS, OF YOUNGSTOWN, OHIO, ASSIGNOR OF ONE-FOURTH TO RUDOLPHG. BEKER, OF SAME PLACE.

ROLLING-MILL.

SPECIFICATION forming part of Letters Patent No. 649,108, dated May 8,1900.

Application filed February 17, 1899. $erial No. 705,813. (No model-lFig. 2 shows the rolls and their pinions in elevation. I

The object of my invention is to provide for the rolling of metalblooms, slabs, and billets with economy of power and with rapidity.

In the drawings, 2 represents the rolls of my improved mill, and 3 4 thefeed-tables on opposite sides of the rolls, provided with the usualmechanism for driving the rollers and for shifting the metal piecelaterally therein. The rolls themselves are driven by suitable pinions 55, geared with a reversing-engine.

The rolls 2 2 have a pass a, adapted to receive pieces initially fedthereto in tandem, and succeeding the pass a is a group of two or morepasses l) I), each of the same crosssection and adapted to receive andreduce like metal pieces. Succeeding the group of passes b b is or maybe a group of passes c c, of smaller cross-section than the passes Z) b,but of equal cross-section with reference to each other. 7

In the operation of the rolls two ingots or blooms 6 6 are introduced intan dem,as shown by the arrow in Fig. 1, to the first pass a of therolls, and having passed therethrough in tandem into the position shownby dotted lines on the table 4 they are turned and shifted.

laterally, so as to be brought into the positions indicated at 6 6 bydotted lines, where they are opposite, respectively, to the passes 19 bof the rolls. The feed-rollers are then reversed, so as to carry themetal pieces in the direction of the arrows to the passes b 1) onto thefeed-table 3, and when on this table they are shifted laterally, so asto be brought into position side by side opposite the passes c 0,respectively, and when the rolls and feedmay be any desired orconvenient number of successive grooves of equal passes.

By theuse of my invention it will be seen that the metal when it isthick in cross-section and requires more power in rolling is carriedthrough the rolls in tandem, so as not to put an undue strain upon thedriving-engine of the rolls,'and afterward, when their cross-section isreduced and they occasion less strain upon the engines, they are rolledside by side or in passes which are side by side.

In mills as heretofore commonlyconstructed there has been considerabledifficulty experienced by the engineer in gaging the amount of steamrequired for driving the rolls in the different stages of the reductionof the metal, much more steam being required in the initial stages ofthe reduction with the heavy passes of metal than in the later stages ofreduction when the load is less. \Vith my invention, however, the workof the engine is made more uniform, the later stages of reduction,involving the passage of two or more metal pieces through the rollssimultaneously, re' quiring no more, or but little more, work than inthe earlier stages, where the metal pieces are rolled in tandem. Thenumber of reversals of the engine is also reduced by my invention, forthe engines need be reversed only one for each two reductions. Thissaves steam and makes the power consumed dur' ing the process ofreduction more uniform. There is also less wear and tear upon the partsof the apparatus by reason of the less number of reversals. Theseadvantages and the advantage due to the greater capacity of a millconstructed in accordance with my invention will be appreciated by thoseskilled in the art.

It will be understood that within the principles of my invention therolls may be modified. For example, there may be two or more of thepasses a, each successively smaller in cross-section than the other. Aswill be noticed in the drawings, I prefer to make the several passes ofthe rolls of substantially too the same depth, but to make each group ofgrooves successively narrower than the preceding group.

I claim- 1. A two-high reversing blooming or slabbing mill, having atthe first pass a groove arranged to receive and roll the ingots orpieces in tandem, and succeeding passes in the same two rolls and formedby similar grooves arranged in groups to roll pieces of likecross-section side by side; substantially as described.

2. A two-high reversing blooming or slabbing mill, having driven feedmechanism, the

said two rolls having a groove forming the first pass and arranged toreceive the metal ingots or pieces in tandem, and having succeedingpasses formed by grooves of like configuration arranged in groups toreceive the pieces side by side, each group being narrower than those ofthe preceding pass; sub stantially as described.

In testimony whereof I have hereunto set my hand.

WALTER RACHALS. Witnesses:

R. G. BEKER,

I-I. STACIIOW.

